header{
        height: 80px;
        width: 100%;
        background-color: #F5F5F5;
    }
    .logo{
        margin-left: 200px;
        margin-top: 15px;
        float: left;
    }
    .help{
        text-align: center;
        font-size: 14px;
        height: 20px;
        width: 30px;
        margin-top: 35px;
        margin-right: 200px;
        float: right;
        font-weight: bolder;
        color: gray;
        text-decoration: none;
    }
    main{
        height: 340px;
        width: 840px;
        margin-left: 200px;
        margin-top: 50px;
        padding: 60px;
        background-image: url("//img/login_bg_05.jpg");
    }
    .login_box{
        height: 300px;
        width: 350px;
        background-color: #fff;
        float: right;
    }
    .login-head{
        height: 40px;
        width: 350px;  
        display: flex;
        justify-content: flex-end;
        background-color: #e08527;
    }
    .login-title{
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        margin: auto;
        line-height: 40px;
        text-align: center;
        color: #fff;
    }
    .icon{
        height: 40px;
        width: 20px;
        background-color: black;
        background-image: url('//img/dragbar.png');
    }
    .login-content{
        background-color: #fff;
        padding: 30px;
    }
    .user-login{
        text-align: left;
        font-weight: bolder;
        margin-top: -30px;
    }
    #username{
        height: 40px;
        width: 290px;
        margin-top: 10px;
        margin-bottom: 10px;
    }
    #password{
        height: 40px;
        width: 290px;
        margin-top: 10px;
        margin-bottom: 10px;
    }
    .choose{
        height: 30px;
        width: 220px;
        font-size: 13px;
        color: red;
        line-height: 30px;
        float: left;
    }
    .forget{
        height: 30px;
        width: 60px;
        line-height: 30px;
        font-size: 13px;
        text-decoration: none;
        color: gray;
        font-weight: bolder;
        float: right;
    }
    .login{
        height: 40px;
        width: 150px;
        background-color: #4e92d9;
        border-radius: 4px;
        float: right;
        color: #fff;
    }
    .foot{
        text-align: center;
        margin-top: 20px;
        color: gray;
        font-size: 12px;
    }